Lamb Shift and Fine Structure ofn=2inCl35xvi

Abstract
We have measured the wavelengths of the 2sS132pP23 and 2sS132pP03 transitions in Cl xvi to be 613.825±0.013 Å and 705.854±0.076 Å. Our precision is sufficient to provide measurements of the 2s122p12 and 2s122p32 Lamb shifts to an accuracy of ±0.3% and to test quantum electrodynamics (QED) theory in the strong-field region. We compare our results with the one-electron QED theories of Mohr and Erickson and discuss the accuracy of calculations of electron correlation in two-electron atoms.